Editing Silverstein Committee (section)

==Notes==
:1.{{note label|id1||none}}The full text of the request can be found in the Appendix of the Semiannual Technical Summary Report on ARPA Orders 14-59 and 47-59.

Until 1963 Saturns were classified by a C and an Arabic numeral. People generally assume that C stood for configuration; but according to Kennedy Space Center's Spaceport News (17 January 1963), MSFC engineers used it to designate vehicular "concepts." Saturn C-1 denoted the concept of the S-1 booster topped with upper stages using liquid hydrogen as a propellant. C-2, C-3, and C-4 were drawing-board concepts that preceded the C-5 (Saturn V) Moon rocket. For additional information on the origins of Saturn, see John L. Sloop, [https://history.nasa.gov/SP-4404/cover.htm ''Liquid Hydrogen as a Propulsion Fuel, 1945-1959, NASA SP-4404''], in press, chap. 12.